To address this fully, they'd need to overhaul the instance servers entirely and tack on a lot more. As a player on Balmung, at peak times, we can have our FC ramming their heads into door, then at the workshop, just trying to get an available instance server. This has happened more than a handful of times.

I imagine all the houses, free company rooms, workshops, etc all will load up an instance server in an available slot. You can have all these homes, rooms, workshops, etc all exist as data but you can't always load into them.

In the end this isn't simply a matter of just adding wards that easily. It's a quite expensive and cost increasing measure I'd imagine to handle a fraction of total rooms/homes available. So they're probably trying to free up as many as possible before investing in this.